Use coupon code "UBRSALE" at checkout to get $50 off the regular price of $249.95. All the Magpul stuff from AIM comes with free shipping. I'm not entirely sure if the sale applies to colors other than black. The link in the newsletter took me to the product page for the black stock.
I think I bought mine 50% off, years ago. I think the AIM sale price is the cheapest that I've seen them since. If you can get past the extra weight and the price, they are very nice.